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Routines |
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The handler for a trapdoor that is open (sprite ID 25). If the low byte of the random number seed at RandomSeed is not zero then the trapdoor is used by FallThroughTrapdoor. Otherwise HandlerTrap_Toggle closes it.
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| HandlerTrapOpen | 37317 | LD A,(24069) | Fetch the random seed from RandomSeed. | |||||
| 37320 | AND A | Test whether it is zero. | ||||||
| 37321 | JP NZ,FallThroughTrapdoor | Jump to FallThroughTrapdoor if it is not. | ||||||
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This entry point is used by the routine at HandlerTrapClosed.
Change the trapdoor from open to closed or the other way round. It is erased and drawn again with a temporary attribute.
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| HandlerTrap_Toggle | 37324 | LD A,(IX+5) | Fetch the attribute of the trapdoor. | |||||
| 37327 | PUSH AF | Stash it on the stack. | ||||||
| 37328 | OR %00000011 | Set bits 0-1, which is temporary. | ||||||
| 37330 | LD (IX+5),A | Update the attribute of the trapdoor. | ||||||
| 37333 | CALL DrawItemGraphic | Call DrawItemGraphic to erase the trapdoor. | ||||||
| 37336 | LD A,(IX+0) | Fetch the sprite ID of the trapdoor. | ||||||
| 37339 | XOR %00000001 | Flip bit 0, which changes the trapdoor from open to closed or the other way round. | ||||||
| 37341 | LD (IX+0),A | Update the sprite ID of the trapdoor. | ||||||
| 37344 | CALL DrawItemGraphic | Call DrawItemGraphic to draw the trapdoor. | ||||||
| 37347 | POP AF | Restore the attribute of the trapdoor from the stack. | ||||||
| 37348 | LD (IX+5),A | Write it to the attribute of the trapdoor. | ||||||
| 37351 | CALL HandlerRoomItem | Call HandlerRoomItem to handle a room item that does nothing. | ||||||
| 37354 | JP SoundsDoor | Jump to SoundsDoor to make the sound of a door. | ||||||
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